Although Stewart, who will star as Princess Diana in the upcoming "Spencer," only considers a small portion of her films as "really good," she only "regretted saying yes to a couple of films" -- which, again, she didn't name.
"The worst is when you're in the middle of something and know that not only is it probably going to be a bad movie, but we're all bracing until the end," she added.
When asked which of her projects she felt were bad she exclaimed, "No! I'm not a mean person — I'm not going to call people out in public."
Earlier this month, Stewart told Entertainment Weekly that she's been pickier about the projects she chooses to take on now --- something she didn't do earlier on in her career.
"I used to be really intentionally the opposite of precious in terms of choosing projects. For a minute there I was like, 'I'll do f------ anything!'" Stewart continued. "And honestly, it was a good place to be for a minute."
She confessed, "But I think now I'm going to be a little more careful. I think I have a better nose for what's going to be fruitful for me personally, as an experience, if not necessarily what's going to thrive out in the world."